The early Shimano 600 derailleurs were revolutionary in a number of ways. They were part of a full groupset - a new phenomenon for a mid level price point, they were designed for Campagnolo drop-outs (gone was the homage to Simplex), and most important of all, they were well finished and looked ruthlessly composed and modern. I can well remember marvelling at the sheer glamour of mid-range bikes kitted out in the full 600 groupset - they looked so much better than their peers clad in a mishmash of Weinmann centre pulls, SR cranks and SunTour V series gears.

This example is a short pulley cage version of the very first generation which, I have been told, have 6000 model numbers (which makes sense - but I have never seen these numbers in a catalogue). The distinguishing feature is that the ‘600’ on the outer parallelogram plate is in large script.

All in all, a pretty damn fine derailleur - particularly in its short cage version, which gave a pleasant fluid gear change despite its lack of a slant parallelogram.

____________________________________________

1. •Brand: Shimano
   

2. •My category: Shimano - the Ultegra story, Shimano - the Deore XT story
   

3. •Country: Japan
   

4. •Date of introduction: 1975
   

5. •Date of this example: 1976 (two letter date code is AG)
   

6. •Model no: 6000?
   

7. •Weight: 232g
   

8. •Maximum cog: 28 teeth (Sutherland’s 6th edition)
   

9. •Total capacity: 28 teeth
   

10. •Pulley centre to centre: 46mm
    

11. •Index compatibility: friction
    

12. •Chain width: 3/32”
    

13. •Logic: top normal
    

14. •Pivots: two sprung pivots
    

15. •Material: largely aluminium, steel pulley cage plates
    

0382/N